Perhaps you should try some spelling variations:
passiv » passive, massiv, passiver
passiven » passiveen, massiven, passiveren, passive, passion
passiverer » passiveerer, massiverer, passivererer, passiverwerb, passivieren, passiver
passivierender » passiveierender, massivierender, passiverierender, passivierende, aktivierender, passivieren

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: ((passiv OR (passiven OR passiverer)) OR passivierender).
• Adding a wildcard symbol may retrieve word variants: ((passiv or (passiven or passiverer)) or passivierender)*.